Steel Sectional Door Projects Steel Sectional Doors for a Coastal Warehouse China Project reference: Steel Sectional Doors for a Coastal Warehouse. Customer Challenge A coastal warehouse required doors resistant to salt spray corrosion and strong onshore wind. Our Solution We supplied fully galvanised steel doors with 80 mm panels, sealed fixings and 1800 Pa engineered reinforcement. Results After 18 months of coastal exposure the doors show no rust creep and operate within force limits.